MIL-S-45860D
necessary. The system shall include all devices such as pressure regulators,
pressure reducers, solenoid valves, and check valves that are necessary to
meet the requirements specified herein. Air pressure gauges shall be provided
to indicate input air pressure in all lines that are downstream from a pres-
sure control device.
3.4.6 Type III machines (hydraulic). The type III machine shall be hy-
draulically operated. The hydraulic system shall be complete, including all
pumps , valves, piping, cylinders, and pressure controls. - Over pressure
protection shall be provided in the high pressure line to prevent damage to
components.
A filter system shall be provided to ensure delivery of clean
fluid. The hydraulic reservoir shall have a means for determining fluid level,
a provision for draining, and a cleanout access plate if the reservior is not
removable.
3.4.7 Type IV machines (mechanical). The type IV machine shall be electro-
mechanically operated. Power shall be transmitted mechanically by V-belts
from an electric motor, to a flywheel, and ram actuating mechanism, with
sufficient force to perform the shrinking and stretching operations, as
specified herein.
3.4.8 Jaw assemblies. The jaw assembly shall consist of an anvil and move-
able jaws made of alloy steel with a surface hardness of not less than 55 on
the Rockwell "C" scale. The jaw assemblies shall be mounted one to the ram or
pressure fingers, and one to the bed by means of a quick-change locking and
releasing device to expedite tooling changeover. The jaw assembly shall per-
form one forming operation per stroke. Unless otherwise specified (see
6.2.1), the standard shrinking assemblies shall have a number 2 stipple or
serrated gripping surface. When surface marking is unacceptable, jaws made of
plastic or other suitable material shall be provided.
3.4.9 Electrical system. The electrical system required on type II, III,
and IV machines, shall conform to NFPA 79. Each machine shall have a fused
safety disconnect switch or circuit breaker. An identified terminal for
grounding the machine, when it is installed shall be mounted in or near the
disconnect switch. The terminal shall be suitable for connecting the size
grounding conductor specified in NFPA 79 for the disconnect fuse rating.
3.4.9.1 Primary input voltage. Unless otherwise specified (see 6.2.1), the
powered machines shall be wired to draw all of its electrical power from a
single 230/460 volt, 3-phrase 60 Hz circuit. The machine shall be initially
wired to operate from a 460 volt source.
3.4.9.2 Motors. Motors shall be rated for continuous duty and shall have
ball or roller bearings of the sealed and permanently lubricated type. Unless
otherwise specified (see 6.2.1), each motor shall have a dripproof enclosure.
Solid state design shall be used through-
3.4.9.3 Solid state components.
out for electronic components.
3.4.9.4 Control circuit voltage. The control circuits shall be isolated
from the input electric power supply by a low-voltage transformer having a
secondary voltage no greater than 120 volts.
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